This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
According to the CMS manual, page D3, the six sets of eight pairs of jumpers (u1....u6) are for the following purpose: ___________________________________ / | / u 1 u 2 u 3 u 4 j2 | / | / | | | | | | | | | | | | u 5 u 6 | |___________________________________________ j1 | | | |______________________| u 1: Boot Scan delay....manual shows no jumpers here in default configuration u 2: first (left) jumper is 'Enable I.C.P. (Yes/No)', middle 6 not used, last (right) is 'multiple initiators (Yes/No)'...manual shows no jumpers in default configuration u 3: Selection phase time out delay....I believe this sets how long the card waits for the drive to come up to speed(?)...manual shows the default as having 4, 5, and 7 with jumpers installed u 4: Arbitration phase time out delay....manual shows default as no jumpers installed u 5: Bus Free phase time out delay...manual shows default as jumper on number 1 u 6: Interrupt recovery delay....manual shows jumpers on 3, 4, and 5 J1 and J2 are single sets of pins. The manual says J2 is not used, but J1 is to be jumpered. The card I have here, came out of a IIGS where it was hooked to first a twenty meg CMS drive, and later a forty meg CMS drive. It has the following jumpers set: u1: jumper on 7 u2: no jumpers u3: jumpers on 4, 5, and 7 u4: no jumpers u5: jumper on 1 u6: jumpers on 3, 4, and 5 j2: no jumper j1: jumper As I recall, this setup yeilded a rather long pause for the hard disk to come up to speed (about 40 to 45 seconds) that we found necessary at the time to avoid boot problems.